The 911 Carrera 4 S shared the Turbo model’s body shell, but housed the naturally-aspirated Varioram 3.6 litre engine in the rear. The 4S came with four-wheel drive and Automatic Braking Differential, and retained the Turbo models larger brake discs with the characteristic red callipers. It could be described as a Turbo without the turbochargers and rear wing, whereas the S was in all aspects a standard Carrera underneath (the wider rear arches were compensated with 31 mm (1.2 in) wheel spacers). 911 C4S models had slightly lowered suspension compared to standard Carrera models. The wide body is widely acclaimed for its looks, and the wider tyres improved road holding.